Bird Identification: CLOSED: Blackbird or What?

We have dozens of these birds in our back yard. My husband calls them Grackles or Blackbirds. Most of them have a yellow bill, and are entirely black, but a few of them look like this guy. He joined this highly offended robin at the birdbath, and I only have the one photo. What is he please?

Our Robins tend to get feisty, but it doesn't seem to happen until the eggs have hatched. That's when they do a great job keeping the Grackles at bay, but we've seen abandoned nests prior to that and the Grackles moving in.